Dave Chinner e10de3723c xfs: don't chain ioends during writepage submission ... Currently we can build a long ioend chain during ->writepages that gets attached to the writepage context. IO submission only then occurs when we finish all the writepage processing. This means we can have many ioends allocated and pending, and this violates the mempool guarantees that we need to give about forwards progress. i.e. we really should only have one ioend being built at a time, otherwise we may drain the mempool trying to allocate a new ioend and that blocks submission, completion and freeing of ioends that are already in progress. To prevent this situation from happening, we need to submit ioends for IO as soon as they are ready for dispatch rather than queuing them for later submission. This means the ioends have bios built immediately and they get queued on any plug that is current active. Hence if we schedule away from writeback, the ioends that have been built will make forwards progress due to the plug flushing on context switch. This will also prevent context switches from creating unnecessary IO submission latency. We can't completely avoid having nested IO allocation - when we have a block size smaller than a page size, we still need to hold the ioend submission until after we have marked the current page dirty. Hence we may need multiple ioends to be held while the current page is completely mapped and made ready for IO dispatch. We cannot avoid this problem - the current code already has this ioend chaining within a page so we can mostly ignore that it occurs. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dave Chinner <david@fromorbit.com>		2016-02-15 17:23:12 +11:00
..
libxfs	Merge branch 'xfs-setxattr-promotion' into for-next	2016-01-19 08:16:08 +11:00
Kconfig
kmem.c	xfs: more info from kmem deadlocks and high-level error msgs	2015-10-12 16:04:45 +11:00
kmem.h	kmemcg: account certain kmem allocations to memcg	2016-01-14 16:00:49 -08:00
Makefile	xfs: stats are no longer dependent on CONFIG_PROC_FS	2015-10-19 08:42:46 +11:00
mrlock.h
uuid.c
uuid.h
xfs.h
xfs_acl.c	xfs: Change how listxattr generates synthetic attributes	2015-12-06 21:34:16 -05:00
xfs_acl.h	xfs: Change how listxattr generates synthetic attributes	2015-12-06 21:34:16 -05:00
xfs_aops.c	xfs: don't chain ioends during writepage submission	2016-02-15 17:23:12 +11:00
xfs_aops.h	xfs: don't chain ioends during writepage submission	2016-02-15 17:23:12 +11:00
xfs_attr.h
xfs_attr_inactive.c	Merge branch 'xfs-misc-fixes-for-4.2-3' into for-next	2015-06-23 08:49:01 +10:00
xfs_attr_list.c	xfs: per-filesystem stats counter implementation	2015-10-12 18:21:22 +11:00
xfs_bmap_util.c	xfs: eliminate committed arg from xfs_bmap_finish	2016-01-11 11:34:01 +11:00
xfs_bmap_util.h	xfs: Add support FALLOC_FL_INSERT_RANGE for fallocate	2015-03-25 15:08:56 +11:00
xfs_buf.c	xfs: Update 2 for 4.5-rc1	2016-01-22 10:54:13 -08:00
xfs_buf.h	xfs: print name of verifier if it fails	2016-01-04 16:10:19 +11:00
xfs_buf_item.c	Merge branch 'xfs-misc-fixes-for-4.3-3' into for-next	2015-08-25 10:13:35 +10:00
xfs_buf_item.h	xfs: fix non-debug build warnings	2015-08-25 10:05:13 +10:00
xfs_dir2_readdir.c	xfs: per-filesystem stats counter implementation	2015-10-12 18:21:22 +11:00
xfs_discard.c	xfs: pass mp to XFS_WANT_CORRUPTED_GOTO	2015-02-23 22:39:08 +11:00
xfs_discard.h
xfs_dquot.c	xfs: eliminate committed arg from xfs_bmap_finish	2016-01-11 11:34:01 +11:00
xfs_dquot.h	xfs: fix implicit bool to int conversion	2015-01-09 10:48:58 +11:00
xfs_dquot_item.c	xfs: move most of xfs_sb.h to xfs_format.h	2014-11-28 14:27:09 +11:00
xfs_dquot_item.h
xfs_error.c	xfs: print name of verifier if it fails	2016-01-04 16:10:19 +11:00
xfs_error.h	xfs: remove inst_t	2015-06-22 09:44:02 +10:00
xfs_export.c	VFS: normal filesystems (and lustre): d_inode() annotations	2015-04-15 15:06:57 -04:00
xfs_export.h
xfs_extent_busy.c	xfs: merge xfs_ag.h into xfs_format.h	2014-11-28 14:25:04 +11:00
xfs_extent_busy.h
xfs_extfree_item.c	xfs: add helper to conditionally remove items from the AIL	2015-08-19 10:01:08 +10:00
xfs_extfree_item.h	xfs: fix efi/efd error handling to avoid fs shutdown hangs	2015-08-19 09:51:16 +10:00
xfs_file.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-01-23 12:24:56 -08:00
xfs_filestream.c	xfs: clean up XFS_MIN_FREELIST macros	2015-06-22 10:13:30 +10:00
xfs_filestream.h
xfs_fsops.c	xfs: growfs not aware of sb_meta_uuid	2015-08-19 10:31:41 +10:00
xfs_fsops.h
xfs_globals.c
xfs_icache.c	xfs: per-filesystem stats counter implementation	2015-10-12 18:21:22 +11:00
xfs_icache.h	xfs: merge xfs_ag.h into xfs_format.h	2014-11-28 14:25:04 +11:00
xfs_icreate_item.c	xfs: move most of xfs_sb.h to xfs_format.h	2014-11-28 14:27:09 +11:00
xfs_icreate_item.h
xfs_inode.c	Merge branch 'xfs-setxattr-promotion' into for-next	2016-01-19 08:16:08 +11:00
xfs_inode.h	xfs: clean up inode lockdep annotations	2015-08-19 10:32:49 +10:00
xfs_inode_item.c	xfs: optimise away log forces on timestamp updates for fdatasync	2015-11-03 13:14:59 +11:00
xfs_inode_item.h	xfs: optimise away log forces on timestamp updates for fdatasync	2015-11-03 13:14:59 +11:00
xfs_ioctl.c	xfs: introduce per-inode DAX enablement	2016-01-04 16:44:15 +11:00
xfs_ioctl.h
xfs_ioctl32.c	xfs: prefix XATTR_LIST_MAX with XFS_	2015-10-12 16:02:56 +11:00
xfs_ioctl32.h
xfs_iomap.c	Merge branch 'xfs-misc-fixes-for-4.5-2' into for-next	2016-01-12 07:04:30 +11:00
xfs_iomap.h	xfs: pass a 64-bit count argument to xfs_iomap_write_unwritten	2015-01-09 10:48:12 +11:00
xfs_iops.c	xfs: Update 2 for 4.5-rc1	2016-01-22 10:54:13 -08:00
xfs_iops.h	xfs: inodes are new until the dentry cache is set up	2015-02-23 22:38:08 +11:00
xfs_itable.c	xfs: fix btree cursor error cleanups	2015-08-19 10:00:53 +10:00
xfs_itable.h	xfs: bulkstat chunk formatting cursor is broken	2014-11-07 08:30:30 +11:00
xfs_linux.h	xfs: pass xfsstats structures to handlers and macros	2015-10-12 05:19:45 +11:00
xfs_log.c	Merge branch 'xfs-misc-fixes-for-4.5' into for-next	2016-01-05 08:08:35 +11:00
xfs_log.h	xfs: validate metadata LSNs against log on v5 superblocks	2015-10-12 15:59:25 +11:00
xfs_log_cil.c	xfs: close xc_cil list_empty() races with cil commit sequence	2015-07-29 11:51:01 +10:00
xfs_log_priv.h	xfs: debug mode log record crc error injection	2016-01-05 07:41:16 +11:00
xfs_log_recover.c	Merge branch 'xfs-misc-fixes-for-4.5-2' into for-next	2016-01-12 07:04:30 +11:00
xfs_message.c	xfs: more info from kmem deadlocks and high-level error msgs	2015-10-12 16:04:45 +11:00
xfs_message.h
xfs_mount.c	Merge branch 'xfs-misc-fixes-for-4.4-2' into for-next	2015-11-03 13:27:58 +11:00
xfs_mount.h	Merge branch 'xfs-dax-updates' into for-next	2015-11-03 13:28:41 +11:00
xfs_mru_cache.c	xfs: xfs_mru_cache_insert() should use GFP_NOFS	2015-03-25 14:57:53 +11:00
xfs_mru_cache.h
xfs_pnfs.c	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
xfs_pnfs.h	xfs: unlock i_mutex in xfs_break_layouts	2015-04-13 11:38:29 +10:00
xfs_qm.c	xfs: updates for 4.4-rc1	2015-11-11 20:18:48 -08:00
xfs_qm.h	xfs: Convert to using ->get_state callback	2015-03-04 16:06:36 +01:00
xfs_qm_bhv.c	xfs: move most of xfs_sb.h to xfs_format.h	2014-11-28 14:27:09 +11:00
xfs_qm_syscalls.c	xfs: saner xfs_trans_commit interface	2015-06-04 13:48:08 +10:00
xfs_quota.h	xfs: fix quota block reservation leak when tp allocates and frees blocks	2015-06-01 07:15:37 +10:00
xfs_quotaops.c	xfs: Add support for Q_SETINFO	2015-03-04 16:06:38 +01:00
xfs_rtalloc.c	xfs: eliminate committed arg from xfs_bmap_finish	2016-01-11 11:34:01 +11:00
xfs_rtalloc.h
xfs_stats.c	xfs: stats are no longer dependent on CONFIG_PROC_FS	2015-10-19 08:42:46 +11:00
xfs_stats.h	xfs: per-filesystem stats counter implementation	2015-10-12 18:21:22 +11:00
xfs_super.c	kmemcg: account certain kmem allocations to memcg	2016-01-14 16:00:49 -08:00
xfs_super.h	xfs: Remove icsb infrastructure	2015-02-23 21:22:31 +11:00
xfs_symlink.c	xfs: eliminate committed arg from xfs_bmap_finish	2016-01-11 11:34:01 +11:00
xfs_symlink.h
xfs_sysctl.c	xfs: pass xfsstats structures to handlers and macros	2015-10-12 05:19:45 +11:00
xfs_sysctl.h
xfs_sysfs.c	xfs: debug mode log record crc error injection	2016-01-05 07:41:16 +11:00
xfs_sysfs.h	xfs: create global stats and stats_clear in sysfs	2015-10-12 05:15:45 +11:00
xfs_trace.c	xfs: move most of xfs_sb.h to xfs_format.h	2014-11-28 14:27:09 +11:00
xfs_trace.h	xfs: add tracepoints to readpage calls	2016-01-08 11:28:35 +11:00
xfs_trans.c	xfs: per-filesystem stats counter implementation	2015-10-12 18:21:22 +11:00
xfs_trans.h	xfs: ensure EFD trans aborts on log recovery extent free failure	2015-08-19 09:51:43 +10:00
xfs_trans_ail.c	Revert "xfs: clear PF_NOFREEZE for xfsaild kthread"	2016-01-19 08:21:46 +11:00
xfs_trans_buf.c	xfs: only trace buffer items if they exist	2015-02-10 09:23:40 +11:00
xfs_trans_dquot.c	xfs: send warning of project quota to userspace via netlink	2016-01-04 16:10:42 +11:00
xfs_trans_extfree.c	xfs: ensure EFD trans aborts on log recovery extent free failure	2015-08-19 09:51:43 +10:00
xfs_trans_inode.c	xfs: optimise away log forces on timestamp updates for fdatasync	2015-11-03 13:14:59 +11:00
xfs_trans_priv.h	xfs: add helper to conditionally remove items from the AIL	2015-08-19 10:01:08 +10:00
xfs_xattr.c	xfs: Change how listxattr generates synthetic attributes	2015-12-06 21:34:16 -05:00